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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |
Fixed maturities, amortized cost | $ 88,247 | $ 77,126 | $ 74,595
Short-term investments, amortized cost | 1,515 | 615 | 757
Nonredeemable preferred stocks, cost | 454 | 756 | 760
Common equities, cost | 808 | 745 | 733
Premium receivable, allowance for credit loss | 516 | 460 | 388
Property and equipment, accumulated depreciation | $ 1,398 | $ 1,461 | $ 1,590
Common shares, par value (USD per share) | $ 1.00 | $ 1.00 | $ 1.00
Common shares, authorized (shares) | 900,000,000 | 900,000,000 | 900,000,000
Common shares, issued (shares) | 798,000,000 | 798,000,000 | 798,000,000
Treasury shares (shares) | 212,000,000 | 212,000,000 | 212,000,000

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